var showAlert = function(msg){

    jAlert(msg, "温馨提示");

}

window.alert=showAlert;

$.alerts={

    verticalOffset:-75,horizontalOffset:0,repositionOnResize:true,overlayOpacity:0.5,overlayColor:'#fff',draggable:true,okButton:' 确定 ',cancelButton:' 取消 ',dialogClass:null,alert:function(message,title,callback){

        if(title==null)title='Alert';

        if(callback){

            $.alerts._show(title,message,null,'confirm',function(result){

                if(callback)callback(result);

            });

        }else{

            $.alerts._show(title,message,null,'alert',function(result){

                if(callback)callback(result);

            });

        }

    }

    ,_show:function(title,msg,value,type,callback){

        $.alerts._hide();

        $.alerts._overlay('show');

        $("BODY").append('<div id="popup_container">'+'<h1 id="popup_title"></h1>'+'<div id="popup_content">'+'<div id="popup_message"></div>'+'</div>'+'</div>');

        if($.alerts.dialogClass)$("#popup_container").addClass($.alerts.dialogClass);

        var pos=($.browser.msie&&parseInt($.browser.version)<=6)?'absolute':'fixed';

        $("#popup_container").css({

            //position:pos,zIndex:99999,padding:0,margin:0

        });

        $("#popup_title").text(title);

        $("#popup_content").addClass(type);

        $("#popup_message").text(msg);

        $("#popup_message").html($("#popup_message").text().replace(/\n/g,'<br />'));

        $("#popup_container").css({

            //minWidth:$("#popup_container").outerWidth(),maxWidth:$("#popup_container").outerWidth(),

            //minWidth:'290px',maxWidth:'290px',

        });

        $.alerts._reposition();

        $.alerts._maintainPosition(true);

        switch(type){

            case'alert':$("#popup_message").after('<div id="popup_panel"><input type="button" value="'+$.alerts.okButton+'" id="popup_ok" /></div>');

                $("#popup_ok").click(function(){

                    $.alerts._hide();

                    callback(true)

                });

                $("#popup_ok").focus().keypress(function(e){

                    if(e.keyCode==13||e.keyCode==27)$("#popup_ok").trigger('click')

                });

                break

            case'confirm':$("#popup_message").after('<div id="popup_panel"><input type="button" value="'+$.alerts.okButton+'" id="popup_ok" /><input type="button" value="'+$.alerts.cancelButton+'" id="popup_cancel" /></div>');

                $("#popup_ok").click(function(){

                    $.alerts._hide();

                    callback(true)

                });

                $("#popup_cancel").click(function(){

                    $.alerts._hide();

                    callback(false)

                });

                $("#popup_ok").focus().keypress(function(e){

                    if(e.keyCode==13||e.keyCode==27)$("#popup_ok").trigger('click')

                });

                break

        };

        if($.alerts.draggable){

            try{

                $("#popup_container").draggable({

                    handle:$("#popup_title")

                });

                $("#popup_title").css({

                    cursor:'move'

                })

            }

            catch(e){}

        }

    }

    ,_hide:function(){

        $("#popup_container").remove();

        $.alerts._overlay('hide');

        $.alerts._maintainPosition(false)

    }

    ,_overlay:function(status){

        switch(status){

            case'show':$.alerts._overlay('hide');

                $("BODY").append('<div id="popup_overlay"></div>');

                $("#popup_overlay").css({

                    position:'absolute',zIndex:99998,top:'0px',left:'0px',width:'100%',height:$(document).height(),background:$.alerts.overlayColor,opacity:$.alerts.overlayOpacity

                });

                break;

            case'hide':$("#popup_overlay").remove();

                break

        }

    }

    ,_reposition:function(){

        var top=(($(window).height()/ 2) - ($("#popup_container").outerHeight() /2))+$.alerts.verticalOffset;

        var left=(($(window).width()/ 2) - ($("#popup_container").outerWidth() /2))+$.alerts.horizontalOffset;

        if(top<0)top=0;

        if(left<0)left=0;

        if($.browser.msie&&parseInt($.browser.version)<=6)top=top+$(window).scrollTop();

        $("#popup_container").css({

            //top:top+'px',left:left+'px'

            //top:'50px',left:left+'px'

        });

        $("#popup_overlay").height($(document).height())

    }

    ,_maintainPosition:function(status){

        if($.alerts.repositionOnResize){

            switch(status){

                case true:$(window).bind('resize',function(){

                    $.alerts._reposition()

                });

                    break;

                case false:$(window).unbind('resize');

                    break

            }

        }

    }

};

jAlert=function(message,title,callback){

    $.alerts.alert(message,title,callback)

}